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Magnetically and optoelectronically isolated trigger for pulse-power applications.

Yi Yu1, Yi-Zhi Wen, Chang-Xuan Yu

  • 1CAS Key Laboratory of Plasma Physics, Modern Physics Department, School of Science, University of Science and Technology of China, 230026 Hefei, People's Republic of China. yuyi@mail.ustc.edu.cn

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

This study presents a magnetically and optically isolated trigger for the KT-5D device. The novel design ensures stable operation in high electromagnetic fields, enabling compatible steady-state and pulse modes.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Control Systems

Background:

  • Ground loops and electromagnetic interference pose challenges in sensitive electronic trigger systems.
  • Existing trigger designs may lack stability in high electromagnetic environments or require frequent power source maintenance.
  • The KT-5D device, functioning as a magnetic torus or tokamak, necessitates a robust and reliable triggering mechanism.

Purpose of the Study:

  • To design and characterize a novel magnetically and optically isolated trigger.
  • To address critical issues in trigger design, including isolation and stability.
  • To demonstrate the trigger's utility in controlling the KT-5D device's operational modes.

Main Methods:

  • Utilized an optical coupler to eliminate ground loops between control systems and power supplies.
  • Employed a magnetic coupler for pulse-power output to a silicon controlled rectifier.
  • Integrated a resistance-capacity branch for adjustable delay timing.
  • Evaluated trigger performance, including output pulse characteristics and stability in electromagnetic fields.

Main Results:

  • Achieved a 230 µs transistor-transistor logic (TTL) output with 3.0 V amplitude.
  • Demonstrated fast rising and trailing times (≤ 4.0 µs) and a precise delay time (6.8 ± 0.2 µs).
  • Implemented adjustable delay up to 72 ms and confirmed long-term stability due to zero quiescent dissipation.
  • Validated stable operation in a 1 T electromagnetic environment.

Conclusions:

  • The magnetically and optically isolated trigger provides robust performance and long operational life.
  • The trigger's design effectively mitigates electromagnetic interference and ground loop issues.
  • Successful application in the KT-5D device enabled seamless switching between steady-state and pulse modes.